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온도 보정 광섬유 OFDR 센서에 의한 그라운드 앵커 인장력 측정
권일범 ( Kwon Il-bum ),권용석 ( Kwon Yongseok ),서대철 ( Seo Dae-cheol ) 한국구조물진단유지관리공학회 2019 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.23 No.1
A monitoring technique of ground anchor force is now studying by measuring the strains distributed on a bearing plate. These distributed strains are measured by a fiber optic OFDR (Optical Frequency Domain Reflectometer) sensor. A sensing optical fiber was attached on the bearing plate at the two radial locations and tested by a universal test machine. The anchor forces can be calculated from the differences of these two trains.
권일범 ( Kwon Il-bum ),박휘립 ( Park Philip ),허용학 ( Huh Yong-hak ),김동진 ( Kim Dong-jin ),이동춘 ( Lee Dong-chun ),홍성혁 ( Hong Sung-hyuk ),문한규 ( Moon Hahngue ) 한국구조물진단유지관리공학회 1999 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.3 No.1
Fiber optic sensors can be embedded in the structures to get the health information in the structures. The fiber sensor was constructed with 3x3 fiber couplers to sense the multi-point strains and failure instants. The 2 RC(reinforced concrete) beams were made to one of A type, one of B type beams. These beams were reinforced by the steel bars, and were experimented under the flexural loading. The behavior of the beams was simultaneously measured by the fiber optic sensors, electrical strain gages, and LVDT. The states of the beams were interpreted by these all signals. By these experiments, There were verified that the fiber optic sensors could measure the structural strains and failure instants of the RC beams. The fiber sensors were well operated until the failure of the beams. It was shown that the strains of the reinforcing steel bar can be used to monitor the health of the beams through the flexural test of RC beams. On the other words, the results were arrived that the two strains in the reinforcing bar measured at the same point can give the information of the structural health status. Also, the failure instants of beams were well detected from the fiber optic filtered signals.
권일범 ( Kwon Il-bum ),권용석 ( Kwon Yongseok ),서대철 ( Seo Dae-cheol ),김치엽 ( Kim Chi-yeop ) 한국구조물진단유지관리공학회 2018 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.22 No.1
Distributed optical fiber sensors have been developed to detect the occurrence of structural anomalies such as excessive stresses, cracks, and leaks at arbitrary locations in the facility. In this paper, we demonstrate fiber optic OFDR (Optical Frequency Domian Reflectometry) sensor to measure strain and temperature through the sensing optical fiber. A PVC pipe was prepared to show the strain measurement performance with a sensing optical fiber attached on the pipe. Also, a temperature test was performed with a sensing optical fiber located in a temperature chamber. In the results, this sensor can operate to resolve 14.2 micro strain and 1.62 degree temperature at the condition of 5 cm spatial resolution.
대형 구조물의 변형률 측정을 위한 광섬유 TR-EFPI 센서의 개량
권일범 ( Kwon¸ Il-bum ),최만용 ( Choi¸ Man-yong ),김치엽 ( Kim¸ Chi-yeop ) 한국구조물진단유지관리공학회 2000 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.4 No.2
The sensor for continuous in-situ monitoring is better to be embedded in large structures. Fiber optic sensors can be embedded in the structures to get the health information in the structures. Fiber optic EFPI(extrinsic Fabry-Perot interferometric) sensors had been shown in many publications which concerned about the structural strain measurement. However, the gage lengths of the sensors in these papers were limited at about 1 cm because it is very difficult to make the long gage length fiber optic EFPI sensor. If the gage length of the fiber optic EFPI sensor could be made as long as about 90 mm, then the sensitivity is to be more higher than the short gage length fiber sensor at about 9 times. In this study, the fiber optic TR-EFPI (total reflected - extrinsic Fabry-Perot interferometric) sensor was developed and was improved to be get the long gage length about 90 mm. The loading-unloading test was performed to confirm the performance of the improved fiber optic TR-EFPI sensor. In this experiment, the strain which was determined by the fiber optic signal had some errors. It was considered that this errors caused by the sliding mismatch in the sensor probe.